Last night I tried to install Solaris 10 on the Ultra 5 I mentioned a couple weeks ago. Well, now I think I know why I got it as a freebie: the CD drive seems to have problems. I could start the installation fine from disk 1, but disk 2 gave me fits - all kinds of errors. If I skipped it and went to 3, I had the same problem. I reburned disk 2 at slower speed but had the same problem.
I will probably try a more basic install just to get up and running, and then upgrade to a more complete system once I can log in. I would think that would be possible; I am no Solaris expert.